From 9a186b357b32325cf77fdce39a6c6c9aff76d8a5 Mon Sep 17 00:00:00 2001
From: Armand Philippot <git@armandphilippot.com>
Date: Tue, 17 May 2022 18:31:21 +0200
Subject: chore: listen scroll to hide/show back to top button

---
 src/components/templates/layout/layout.tsx | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

(limited to 'src/components/templates/layout/layout.tsx')

diff --git a/src/components/templates/layout/layout.tsx b/src/components/templates/layout/layout.tsx
index 9e9282b..3eb02ee 100644
--- a/src/components/templates/layout/layout.tsx
+++ b/src/components/templates/layout/layout.tsx
@@ -7,11 +7,12 @@ import Home from '@components/atoms/icons/home';
 import PostsStack from '@components/atoms/icons/posts-stack';
 import Main from '@components/atoms/layout/main';
 import NoScript from '@components/atoms/layout/no-script';
-import Footer, { FooterProps } from '@components/organisms/layout/footer';
+import Footer, { type FooterProps } from '@components/organisms/layout/footer';
 import Header, { type HeaderProps } from '@components/organisms/layout/header';
+import useScrollPosition from '@utils/hooks/use-scroll-position';
 import useSettings from '@utils/hooks/use-settings';
 import Script from 'next/script';
-import { FC, ReactNode } from 'react';
+import { FC, ReactNode, useState } from 'react';
 import { useIntl } from 'react-intl';
 import {
   BreadcrumbList,
@@ -162,6 +163,19 @@ const Layout: FC<LayoutProps> = ({
     subjectOf: { '@id': `${url}` },
   };
 
+  const [backToTopClassName, setBackToTopClassName] = useState<string>(
+    styles['back-to-top--hidden']
+  );
+  const updateBackToTopClassName = () => {
+    setBackToTopClassName(
+      window.scrollY > 300
+        ? styles['back-to-top--visible']
+        : styles['back-to-top--hidden']
+    );
+  };
+
+  useScrollPosition(updateBackToTopClassName);
+
   return (
     <>
       <Script
@@ -203,6 +217,7 @@ const Layout: FC<LayoutProps> = ({
         copyright={copyrightData}
         navItems={footerNav}
         topId="top"
+        backToTopClassName={backToTopClassName}
         className={styles.footer}
       />
       <noscript>
-- 
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